ref: 0df3f94ecdd32b5ee4ca3f8f8a73f4a7a455ddfb dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4